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Radial vibration measurements directly from rotors using Laser Vibrometry: uncertainty due to surface roughness

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conference contribution
posted on 04.12.2015, 14:20 by Steve Rothberg
Radial vibration measurements taken directly from rotors using Laser Vibrometry are known to show a significant cross-sensitivity to the orthogonal radial vibration component. A process for resolving the individual components is now well established and is suitable for both radial measurements and pitch / yaw measurements which show an equivalent cross-sensitivity. All of the work conducted in the development of this system was done using surfaces treated with retro-reflective tape, a common surface treatment for Laser Vibrometer measurements. In this paper investigations have been conducted on untreated surfaces with roughness close to or less than the wavelength of light. These investigations have highlighted an inherent uncertainty for measurements in this roughness range related to changes in the effective centre of the incident laser beam. This uncertainty is shown to be influenced by surface roundness and incident beam diameter as well as by the surface roughness itself. At even lower surface roughness on rotors with low roundness error, it is possible that the cross-sensitivity may be negligible.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Conference Proceedings of the Society for Experimental Mechanics Series

Citation

ROTHBERG, S., 2007. Radial vibration measurements directly from rotors using Laser Vibrometry: uncertainty due to surface roughness. IN: Proceedings of Modal Analysis Conference 2007 (IMAC-XXV): a Conference and Exposition on Structural Dynamics, 19th-22nd February 2007, Orlando Florida. Curran Associates, volume 1, pp. 585-593.

Publisher

Curran Associates / © Society for Experimental Mechanics Inc.

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2007

Notes

This conference paper is available here with the kind permission of the Society for Experimental Mechanics.

ISBN

9781604237597

ISSN

2191-5644

eISSN

2191-5652

Language

en

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